Spike-driving machine



J. H. DOAK.

SPIKE DRIVING MACHINE. APPLICATION FILED r11/m29, 1921.

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SPIKE DRIVING MACHINE.

APPLICATION HLED 1111111.29, 1921.

Mente@ 1311.311922.

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J. H. DOAK.

SPIKE DRIVING MACHINE.

APPLICATION FILED MAR. 23,` 192i.

Patented Jan. 31, 1922.

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/ZIIIEIVIVLiiyA iran sr E Joan H. Donk, lor Borse, IDAHO.

SPIKE-DRXVIN Gr MACHILNE.

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Specic'aton of Letters Patent.

Patented Jan. 31, 1922.

Application ledarch 29, 1921. Serial No. 456,674.

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Be it known that I, `JOHN H. Donk, a cit zen of theiUnited States,residing at. Boise, in the county of Ada andState of Idaho, haveinvented new and useful Improvements yin Spike-Driving Machines, of4which the following is a specification.

My invention pertains `to that class of dc-v vices which has for itsobject the ymechanical driving of railroad spikes. It is intended toprecede the flat car carrying the rails and ties and drives the spikesas ittravels over the newly laid rails. v

In the accompanying drawings Fig. 1 is a .side elevation of thelmachine. c

Fig. 2 is an end View of the hammer control lever. f Y

Fig. 3 is a section of the striker shaft and housing.

Fig. 4 is a. top view of the machine ,with a ortion of the protectingplate cut awa-y.

IFig. 5 is a front elevation of the [foot pedal control for the hammer.

Fig. 6 is a top view of Fig. 5.

Fig. 7 is a front elevation of the machine.

Figures 8 and 9 are respectively top and side views of the spike holder.

Fig. 10 is section A-A of Fig. 8.

In operating the machine the person in charge thereof stands on platform1 at the front of the machine, to which pointall controls are run. Thefour hammers 2, 3, 4, and 5, pivot/ed at points midway their length, as6, are used to drive the spikes 7, 8, 9, and 10 by allowing the hammerheads 11, 12, 13, and 14, to fall upon strikers 15, 16, 17, and 18 whichin turn strike the spikes and force them into tie 19. All of thestrikers are equipped with springs, as 20, which normally raise thestriker points to clear thc splkes, but these springs are not ofsufficient strength to support the hammer heads. The hammer heads areraised by rotating arms, as 21, which come in contact with slide 22 andafter raising the hammer heads, suddenly release them. Rollers areprovided on the end of arms 21 to reduce the friction on slide 22. Slide22 runs in a groove cut in the hammer arm, Fig. 2, and its position iscontrolled by lever 23. The latter is an ordinary lever with a springcatch which meshes in the toothed sector 24. Shaft 25 and dog 26 serveto raise the spring catch 27, Shaft 25 is operated by a rod 28 whichruns to the operators platform. The four rods 28, 29,

30, and 31 control the levers operating the four slides. .By movinglever 23 back'and `forth slide 22 lis brought more or less intoengagement with'arm 21, the extent of the Contactdetermining the amounthead 11 is raised. When it is desired to stop the operation of `anyhammer, as'2, lever 23 is moved to a certain known position which allowsarm 21 to raise head 11 to the position shown in the drawings. At thesame time foot lever 32u is pressed down until it is held by catch 33.vThe arm of the foot lever opposite the pedal carries a spring pawl,Figures 5 and 6, 34 which is kept in place by spring 35 but isrestricted in its forward motion by Y' catch 36 which comesin contactwith thc lever arm. As hammer 2 rises, a. projection, 37, on its sidepasses up the inclined forward surface of pawl 34, forcing itback untilprojection 37 passes the pawl, when it springs forward and yprevents thehammer descending. The travel ofthe hammer is regulated for thisoperation until `it just passes the top of pawl 34. Slide 22 is thenwithdrawn from contact witharm 21 and there is no further movement ofthe hammer until catch 33 is released. The foot levers 32, 38, 39, and40 are normally kept elevated by springs 41, 42, 43, and 44 so 'thatthere wil be no engagement of the pawls and hammer arms. Arms 21, 45,46, and one opposite 46 which is not shown in the drawing, are mountedon shaft 48. The latter is driven by gear 49, which is in turn driventhrough clutch 50 gas engine 53. `lutch 50 isr controlled by lever 54through rod 55 and lever 56. The whole car is moved forward by movinglever 57 which acting through rod 58, lever 59, and clutch 60 causes theloose -sprocket 61 to ro pulley 51, and belt 52 by tate. The latterdrives chain 62 which passes over sprocket 63 on the shaft of the reartrucks.

Spikes are lplaced inthe tops of chutes 64, 65, 66, and 67 whence theydrop into position beside the' rail. The spike descends withconsiderable speed and striking incline 68, Figures 8, 9, and 10, slidesdown this until the head rests in'recess 69 with the shaft vertical. Thetravel toward the rail is restricted by projections 70 and 71. Reboundfrom these projections is prevented by the pressure of spring 72. Thejaws 73 and 74 are hinged at 75 and 76, respectively. This arrangement,with spring 72, allows the spike to be held firmly in place yet forms ayielding support Ywhich gives way and allows the head of the spike topass through when it is being driven. n Y

Troughs 77 and 7 8, with rollers 79, SO, 8l, and 82 are provided tocarry the rails from the flat car in rear to their place in front of'the spike driver. An incline with rest is provided on the forward end ofeach trough to facilitate the .removal of the rail.

The device herein described is intended to replace the large crew of menrequired in spike' driving when new railroad track is laid. The lwork isdone rapidly, four spikes are driven at one time, and the whole track isspiked at the time or" laying instead of havinfa follow'u francv to comDiete the'- spike driving which remains when the present system isemployed. This eliminates the need of Stringing spikes along the trackand a very large portion of the work to be done after the track layerhas passed.

What lf claim as my. invention is:

l. In a spike vdriving device of the type described a set of fourpivoted hammers, weight elements on one end of each of said hammers andslide elements for 'regulating the travel thereof` mounted on the otherends, rotating arms to engage the slide elements and raise and releasethe weight elements, means Jfor driving the rotating arms, means ofpositioning and feeding the spikes, striker elements to receive thehammer blow and transmit it to the spike, and stops to prevent theaction of the hammers.

2. In a spike driving device of the type described striker elements toContact with the spikes,'pivoted lever hammer elements, weights on theforward ends thereof to impact on they striker elements, adjustableslide elements on the other ends of the hammer levers, rotating arms tocontact with the slide elements and lower and release the same, means ofdriving theV rotating arms, means of feeding and positioning the spikes,and stops to prevent the action of the hammers. l .Y K

8. In a spike driving device of the type described striker elements torcontact with the spikes, chutes and recessed spring jaws for feeding andpositioning the spikes,lpivoted hammer elements, weights on the for wardends thereof tovimpact on the striker elements', adjustable levercontrolled slide elements on the lother ends of the hammer elements,rotating arms to contact with the slide elements andlower and releasethe same, means of driving the rotatingarms, and stops to prevent theaction of the hammers. Y A Y JOHN H. DOAK. Witnesses: .l i n JOHN D.CAMoMrnn, W. N. GUNDRY.

